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From Wikipedia:

Space Patrol is a science fiction adventure series set in the 30th century that was originally aimed at juvenile audiences of the early 1950s via television, radio, and comic books. It soon developed a sizable adult audience, and by 1954 the program consistently ranked in the top 10 shows broadcast on a Saturday.

The radio version ran from 4 October 1952 to 19 March 1955, for 129 episodes. The same cast performed on both shows. The writers, scripts, and directors were reused between the radio and TV incarnations, but the radio broadcasts were not limited by studio sets and became more expansive in scope than the television programs. Although there was seldom any deliberate crossing-over of storylines, some of the television villains regularly appeared on the radio (notably Prince Bacarratti), and during the "Planet X" story, both the TV and radio versions explored the rogue planet's invasion of the Space Patrol universe.

While the radio series lacked the sophistication of sci-fi shows like the later X Minus One, it was enjoyed as a throwback to the Golden Age of space opera popularized in the 1930s by pioneering magazine editor Hugo Gernsback.